Whereas regarding Moshe, which is the level of “returning to reveal the One Hashem in this world,” which reveals Hashem’s Oneness on the level of Yichuda Ila’ah, it is written: “it will be a continual lamp.”
Since it is a revelation of Hashem’s Oneness that is above the limitations of time, and before Hashem “darkness and light are the same” (Tehillim 139:12), since “He is always the same, and he makes everything else completely equal in comparison to Him.”
This explanation will be enough for one working to understand.